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A graceful pea-gravel car park is around the front door of the newly completed home at 8 Carriage Trail, the first home to be built at Greystone on Hudson, a new high-end gated community on 100 acres in Tarrytown. Mark Vergari/The Journal News

The developers saved a magnificent old sycamore tree, at right in the front yard. “We know it dates to at least 1891 because you can see it in old photos of the stables,” says developer AndyTodd. Mark Vergari/The Journal News

A graceful pea-gravel car park is around the front door of the newly completed home at 8 Carriage Trail, the first home to be built at Greystone on Hudson, a new high-end gated community on 100 acres in Tarrytown. Mark Vergari/The Journal News

The kitchen in the first completed estates at Greystone on Hudson, a new high-end gated community on 100 acres in Tarrytown, The home sold for over $9 million earlier this year. Mark Vergari/The Journal News

The playroom on the lower level is enormous. In the distance you can see the scoreboard for the indoor basketball court. The room was being painted last week, in preparation for the grand opening party on Tuesday evening Mark Vergari/The Journal News

Andy Todd, the president of the Greystone Mansion Group, gestures toward one of two wooded ravine plots at Greystone on Hudson, a new high-end gated community on 100 acres in Tarrytown. Mark Vergari/The Journal News

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Greystone on Hudson, the new 20-mansion gated community in Tarrytown and Greenburgh, is off to a blistering start, with the first estate selling for $9 million just nine days after coming on the market.

That makes it the top residential sale in Westchester so far this year. No brokers were involved on either side of the deal, which drew multiple offers.

"We've had a tremendous amount of interest in the house," said developer Andy Todd, president of the Greystone Mansion Group.

Boasting amenities like an indoor basketball court, 11 bathrooms and an 800-square-foot 'hers' closet in the master suite, the list price for the 20,000-square-foot house at 8 Carriage Trail was $9,998,888.

The buyer of the 36-room house is a "top executive with a Fortune 500 company who is moving within the county," Todd said. He and his family are planning to move in soon after the closing, which is set for Aug. 17.

Greystone on Hudson sits on the east side of Route 9/South Broadway directly across from Lyndhurst, the 67-acre former estate of Jay Gould. It was known as Millionaire's Row during the Gilded Age, home to Astors, Lehmans, Morgans, Vanderbilts and Rockefellers.

In the late 19th and early 20th centuries, a 40-plus room Italianate mansion known as Greystone Castle occupied this site. After a fire, it was torn down in the 1970s.

Each of the luxury homes will be on 2- to 5-acre landscaped parcels, with prices ranging from $5 million to $20 million. Some of the hilltop parcels will have expansive views of the Hudson River and the Tappan Zee Bridge, while others are woodsy lots with views of The Castle in Tarrytown.

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The den in one of the completed homes at Greystone on Hudson, a new high-end gated community on 100 acres in Tarrytown, photographed June 4, 2015.(Photo: Mark Vergari/The Journal News)

Eight of the lots are in Tarrytown and 12 are in Greenburgh. All are in the Irvington school district.

"We're getting such positive feedback -- it's been phenomenal," Todd said. "Everyone is loving the grounds, loving the house we built."

The rest of the 19 mansions will be built over the next three to four years, he said. For the second house, "we'll have shovels in the ground in the next month-ish, and it takes about nine months to build a house."

Amenities in the just-sold house at 8 Carriage Drive include a 14-seat home theater; geothermal heating and cooling; a yoga/workout room; a lower-level sports complex with a basketball court, rock climbing wall and a pair of locker rooms; and that big dressing room in the master suite, with a separate makeup area and an internal Imelda Marcos-style closet for shoes.

There is also a covered porch with a fireplace and outdoor TV, a downstairs arts and crafts room, and a wine cellar fashioned from reclaimed New England barn siding.

All seven bedrooms are en suite, with their own bathrooms and finished closets. On the first floor, all of the ceilings are at least 10 feet, with some soaring to 25 feet. On the second floor, they range in height from nine to 14 feet.

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Andy Todd, president of the Greystone Mansion Group, in the first finished house in the new Greystone on Hudson development.(Photo: Mark Vergari/The Journal News)

In the 2.73-acre yard, the buyer plans to add a swimming pool, cabana and tennis court. They will be built "between now and next summer," Todd said.

The developers are trying to preserve the atmosphere left from the Gilded Age days of the castle and make the new look old again. As much as possible, they saved the on-site rock outcroppings of Manhattan schist (just like the ones you'll see in Central Park) and stately old-growth forest trees. And they were able to dig up, restore and reuse the old winding road that led up the hillside to the castle from Route 9.

The perimeter of the 100-acre property is lined with 17,000 linear feet of 8-foot-tall black estate fencing, Todd said.

The developers bought the parcel in 2012 and have been under construction for most of the last two years.